Problem with Mark_engraver

[liang seng]

Hi, I'm using Lilypond 2.7.27 for Windows 98. There seems to be a problem 
regarding the Mark_engraver property. Apparently, when Mark_engraver is 
used, it seems to disregard the
\set Score.rehearsalMarkAlignSymbol property. Here is an example:
\version "2.7.27"
align = \set Score.rehearsalMarkAlignSymbol = #'time-signature
linea = { \align  \mark "Rehearsal Mark" R1 }
lineb = { \align  \mark "Rehearsal Mark" R1 }

\score {
\new StaffGroup { <<
\new Staff { \linea }
\new Staff \with{\consists "Mark_engraver"} { \lineb }
>> } }
The placement of the rehearsal mark on the first staff is correct, but wrong 
in the second staff as the rehearsal mark is centrally aligned to the 
beginning of the staff, disregarding the rehearsalMarkAlignSymbol property. 
I've tried this when setting it to align to clefs and key signatures and 
they do not alter the result of the rehearsal mark's placement of the second 
staff as well. Is this a bug?
Thank you.

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